> cd /root/.cpan/build/WWW-Mechanize-1.64-_fbjEy 
> /usr/bin/perl Makefile.PL INSTALLDIRS=site 

##</code><code>##

It looks like you don't have SSL capability (like IO::Socket::SSL) installed. 
You will not be able to process https:// URLs correctly.

##</code><code>##

> sudo apt-get install libhttp-daemon-ssl-perl 

##</code><code>##

> apt-cache search WWW::Mechanize           
> sudo apt-get install libwww-mechanize-perl